text: Many grow lights often missing an integrating sphere test report which means that values like photosynthetic photon flux (PPF) are guessed by the manufacturer. Also, false advertising of photosynthetic photon efficacy (PPE) (photosynthetic photon flux (PPF) μmol/W) values from grow light manufacturers can be avoided by simply control calculate the value. Furthermore, some manufacturers state the photosynthetic photon flux density (PPFD) value of the center light-emitting diode (LED) instead of the PPF in the area of one square meter.